Boston Marathon logo
BOSTON MARATHON 2023

Alexandria Kasprzak

Bib: 15409•F

NV

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 47%
Gender (Female)
#0 / 11423
Top 30%
Division (F18-39)
#0 / 4884
Top 48%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:46/mi
24:09
↑ 97↓ 3451.5%
10K· 6.21 mi
7:47/mi
48:20
↑ 79↓ 1380.4%
15K· 9.32 mi
8:04/mi
1:13:23
↑ 67↓ 78
20K· 12.43 mi
7:52/mi
1:37:49
↑ 106↓ 860.1%
Half· 13.11 mi
7:56/mi
1:43:14
↑ 19↓ 370.5%
25K· 15.53 mi
7:53/mi
2:02:21
↑ 66↓ 880.2%
30K· 18.64 mi
8:04/mi
2:27:25
↑ 181↓ 1480.2%
20M
8:40/mi
2:39:11
↑ 64↓ 500.2%
21M
9:04/mi
2:48:15
↑ 106↓ 241.6%
35K· 21.75 mi
8:24/mi
2:54:32
↑ 17↓ 861.7%
23M
8:28/mi
3:05:08
↑ 23↓ 630.6%
24M
8:06/mi
3:13:14
↓ 821.3%
40K· 24.85 mi
8:23/mi
3:20:24
↓ 200.3%
25.2M
8:33/mi
3:23:21
↑ 13↓ 160.2%
Finish· 26.22 mi
7:22/mi
3:30:51
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:43:14
Pace7:52 /mi
2nd Half
Distance13.11 mi
Time1:47:37
Pace8:13 /mi
📊Positive Split: 4.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:5324:097:4624:09
7:46
-
10K
6.21 mi11:19:0448:207:4724:11
7:47
+0:01
15K
9.32 mi11:44:071:13:237:5225:03
8:04
+0:17
20K
12.43 mi12:08:331:37:497:5224:26
7:52
-0:12
Half
13.11 mi12:13:581:43:147:525:25
7:56
+0:04
25K
15.53 mi12:33:052:02:217:5319:07
7:53
-0:03
30K
18.64 mi12:58:092:27:257:5425:04
8:04
+0:11
20M
20.00 mi13:09:552:39:117:5811:46
8:40
+0:36
21M
21.00 mi13:18:592:48:158:019:04
9:04
+0:24
35K
21.75 mi13:25:162:54:328:026:17
8:24
-0:40
23M
23.00 mi13:35:523:05:088:0310:36
8:28
+0:04
24M
24.00 mi13:43:583:13:148:038:06
8:06
-0:22
40K
24.85 mi13:51:083:20:248:047:10
8:23
+0:17
25.2M
25.20 mi13:54:053:23:218:042:57
8:33
+0:10
Finish
26.22 mi14:01:353:30:518:037:30
7:22
-1:11

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

7:22 /mi

Average Pace

8:03 /mi

Slowest Pace

9:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

55:50

26% of race

Time at Steady Pace

1:47:11

51% of race

Time at Slower Pace

47:50

23% of race

Average Pace: 8:02 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:54:5324:097:4624:09
7:46
#12129
10K
6.21 mi11:19:0448:207:4724:11
7:47
#12522
15K
9.32 mi11:44:071:13:237:5225:03
8:04
#13354
20K
12.43 mi12:08:331:37:497:5224:26
7:52
#13056
Half
13.11 mi12:13:581:43:147:525:25
7:56
#13087
25K
15.53 mi12:33:052:02:217:5319:07
7:53
#12827
30K
18.64 mi12:58:092:27:257:5425:04
8:04
#12534
20M
20.00 mi13:09:552:39:117:5811:46
8:40
#12701
21M
21.00 mi13:18:592:48:158:019:04
9:04
#12741
35K
21.75 mi13:25:162:54:328:026:17
8:24
#12828
23M
23.00 mi13:35:523:05:088:0310:36
8:28
#12839
24M
24.00 mi13:43:583:13:148:038:06
8:06
#12775
40K
24.85 mi13:51:083:20:248:047:10
8:23
#12753
25.2M
25.20 mi13:54:053:23:218:042:57
8:33
#12706
Finish
26.22 mi14:01:353:30:518:037:30
7:22
#12486
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi121292942294214906(Top 56%)4619(Top 40%)4619(Top 95%)
10K6.21 mi3.10 mi12522-3933170-2283170-22812993(Top 49%)3422(Top 30%)3422(Top 70%)
15K9.32 mi3.11 mi13354-8323665-4953665-49514906(Top 56%)4619(Top 40%)4619(Top 95%)
20K12.43 mi3.11 mi13056+2983514+1513514+15112299(Top 46%)3136(Top 27%)3136(Top 64%)
Half13.11 mi0.68 mi13087-313536-223536-2213900(Top 52%)4009(Top 35%)4009(Top 82%)
25K15.53 mi2.42 mi12827+2603414+1223414+12211822(Top 44%)2975(Top 26%)2975(Top 61%)
30K18.64 mi3.11 mi12534+2933277+1373277+13711441(Top 43%)2873(Top 25%)2873(Top 59%)
20M20.00 mi1.36 mi12701-1673400-1233400-12314620(Top 55%)4772(Top 42%)4772(Top 98%)
21M21.00 mi1.00 mi12741-403436-363436-3613803(Top 52%)4381(Top 38%)4381(Top 90%)
35K21.75 mi0.75 mi12828-873501-653501-6514720(Top 55%)4934(Top 43%)4934(Top 101%)
23M23.00 mi1.25 mi12839-113532-313532-3113004(Top 49%)4067(Top 36%)4067(Top 83%)
24M24.00 mi1.00 mi12775+643518+143518+1411968(Top 45%)3569(Top 31%)3569(Top 73%)
40K24.85 mi0.85 mi12753+223524-63524-612600(Top 47%)3992(Top 35%)3992(Top 82%)
25.2M25.20 mi0.35 mi12706+473503+213503+219975(Top 37%)2691(Top 24%)2691(Top 55%)
Finish26.22 mi1.02 mi12486+2203398+1053398+1057552(Top 28%)1657(Top 15%)1657(Top 34%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 56%
×21story building
+97ft-345ft

Overall

14906

Females

4619

F18-39

4619

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

12993

Females

3422

F18-39

3422

10K→15K

6.2 - 9.3 mi

Top 56%
×3story building
+67ft-78ft

Overall

14906

Females

4619

F18-39

4619

15K→20K

9.3 - 12.4 mi

Top 46%
×5story building
+106ft-86ft

Overall

12299

Females

3136

F18-39

3136

20K→Half

12.4 - 13.1 mi

Top 52%
×2story building
+19ft-37ft

Overall

13900

Females

4009

F18-39

4009

Half→25K

13.1 - 15.5 mi

Top 44%
×4story building
+66ft-88ft

Overall

11822

Females

2975

F18-39

2975

25K→30K

15.5 - 18.6 mi

Top 43%
×9story building
+181ft-148ft

Overall

11441

Females

2873

F18-39

2873

30K→20M

18.6 - 20.0 mi

Top 55%
×5story building
+64ft-50ft

Overall

14620

Females

4772

F18-39

4772

20M→21M

20.0 - 21.0 mi

Top 52%
×8story building
+106ft-24ft

Overall

13803

Females

4381

F18-39

4381

21M→35K

21.0 - 21.8 mi

Top 55%
×7story building
+17ft-86ft

Overall

14720

Females

4934

F18-39

4934

35K→23M

21.8 - 23.0 mi

Top 49%
×5story building
+23ft-63ft

Overall

13004

Females

4067

F18-39

4067

23M→24M

23.0 - 24.0 mi

Top 45%
×6story building
+12ft-82ft

Overall

11968

Females

3569

F18-39

3569

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

12600

Females

3992

F18-39

3992

40K→25.2M

24.9 - 25.2 mi

Top 37%
×1story
+13ft-16ft

Overall

9975

Females

2691

F18-39

2691

25.2M→Finish

25.2 - 26.2 mi

Top 28%
×2story building
+22ft-21ft

Overall

7552

Females

1657

F18-39

1657

Passing Analysis

Category:
Athletes Passed
1902
Passed By
2259
Net Change
-357
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12129
5K → 10K157550-393#12129#12522
10K → 15K31863-832#12522#13354
15K → 20K34648+298#13354#13056
20K → Half2455-31#13056#13087
Half → 25K29434+260#13087#12827
25K → 30K35360+293#12827#12534
30K → 20M58225-167#12534#12701
20M → 21M80120-40#12701#12741
21M → 35K29116-87#12741#12828
35K → 23M7788-11#12828#12839
23M → 24M10036+64#12839#12775
24M → 40K7149+22#12775#12753
40K → 25.2M5710+47#12753#12706
25.2M → Finish2255+220#12706#12486
TOTALS19022259-357
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing